Trade
E1
The Vice Squad investigate a series of murders of street prostitutes. Chappel gets involved with a young prostitute and is convinced that an arrogant city slicker who has befriended her is behind the murders.
No Man's Land
E2
DI Chappel targets a former porn baron who is still involved in prostitution. PC Morgan goes under cover as a party prostitute but takes the role too far.
One More Time
E3
DI Chappel goes under cover as a lodger to investigate a suspected porn merchant, but PC Hutchins discovers the house is the base for a paedophile ring.